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OCR: InfoModeler - [Info|20 Diagram Edit View Info Tools Maintenance Options Window Help BE Fact Assistant Fact Objects Examples Constraints Warnings Rephrase: Each City contains how many Campus? zero of one Rephrase: For the fact 'Campus has City that contains it' exactly one + How many instances of 'City' are recorded for each instance of 'Campus'? zero or one zero or more exactly one one or more frequency ... City(name) contains Campus[name] Each City contains at most one Campus and Each and every Campus has exactly one City that contains it Examples: City "London' contains Campus "King's College' City 'London' contains Campus "Imperial College' New Fact Options ... Close Help This question is about mandatory & uniqueness. 404|| Students/instructors Figure 2 - Fact Assistant in V1.5 helps to set up constraints